diff --git a/1.6/Dockerfile b/1.6/Dockerfile
index ae3f3b2..fa358d9 100644
--- a/1.6/Dockerfile
+++ b/1.6/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.3.21-fpm-buster@sha256:0089dd22a25ec37432f89996d30baec52adf5d0ac7be32d7e1455bd2bba99de6
+FROM php:7.4.9-fpm-buster@sha256:4bb8a6db3122ee302e990b0f2a6d709fb791dde5843cfbcb3fefdf26e9cdf8f2
 
 # renovate: datasource=github-tags depName=getgrav/grav versioning=semver
 ENV GRAV_VERSION 1.6.27
diff --git a/1.7/Dockerfile b/1.7/Dockerfile
index 462777f..9f6ef76 100644
--- a/1.7/Dockerfile
+++ b/1.7/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.3.21-fpm-buster@sha256:0089dd22a25ec37432f89996d30baec52adf5d0ac7be32d7e1455bd2bba99de6
+FROM php:7.4.9-fpm-buster@sha256:4bb8a6db3122ee302e990b0f2a6d709fb791dde5843cfbcb3fefdf26e9cdf8f2
 
 # renovate: datasource=github-tags depName=getgrav/grav versioning=semver
 ENV GRAV_VERSION 1.7.0-rc.16